44 lines
1.2 KiB
C++
44 lines
1.2 KiB
C++
/*
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KWin - the KDE window manager
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This file is part of the KDE project.
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SPDX-FileCopyrightText: 2018 Martin Flöser <mgraesslin@kde.org>
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SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#pragma once
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#include <xcb/xcb.h>
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#include <cstring>
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namespace KWin
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{
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class GeEventMemMover
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{
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public:
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GeEventMemMover(xcb_generic_event_t *event)
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: m_event(reinterpret_cast<xcb_ge_generic_event_t *>(event))
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{
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// xcb event structs contain stuff that wasn't on the wire, the full_sequence field
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// adds an extra 4 bytes and generic events cookie data is on the wire right after the standard 32 bytes.
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// Move this data back to have the same layout in memory as it was on the wire
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// and allow casting, overwriting the full_sequence field.
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memmove((char*) m_event + 32, (char*) m_event + 36, m_event->length * 4);
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}
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~GeEventMemMover()
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{
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// move memory layout back, so that Qt can do the same without breaking
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memmove((char*) m_event + 36, (char *) m_event + 32, m_event->length * 4);
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}
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xcb_ge_generic_event_t *operator->() const {
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return m_event;
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}
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private:
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xcb_ge_generic_event_t *m_event;
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};
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}
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